The title, more or less, sums it up. I plan to bury some THHN/THWN-2 feeders, and my jurisdiction allows a 6" bury depth if I use IMC or RMC. I plan to use IMC, which comes with both a male and female threaded end. Do I need to use any sealant on these threads to prevent water ingress?
Unfortunately, I don't think I will be lucky enough to avoid cutting any conduit to get the length I need. How do I couple unthreaded IMC underground? Do I need to use liquid-tight fittings?
My guess is that I don't need any sealants or special fittings because the THWN-2 wires are suitable for wet locations, but I'd like to make sure, in case I need to order special fittings.